Get data outside Loop in JQuery

I have an issue where it returns an unidentified when I tried to console the data by clicking get all input type data, All I want is to get the value of each input type and store it on list using push should I make another for loop? just to reiterate each value?

var selected_obj ={ 
            quantity: testtttttt examplee
       }
selected_items.push(selected_obj);

what I've tried

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

$("#allcb").change(function() {
  $('tbody tr td input[type="checkbox"]').prop(
    "checked",
    $(this).prop("checked")
  );
});

$(document).on("keyup", ".quantity_input", function() {
  var $row = $(this).closest('.row');
  var value_input = 0;
  var price_value = 0;
  var total_value = 0;

  value_input = $(".quantity_input", $row).val();
  price_value = $(".price_value", $row).html();
  total_value = parseInt(value_input) * parseInt(price_value);
  $(".total_value_row", $row).text(total_value);
});

$(document).on("click", ".remove_data", function() {
  var $row = $(this).closest('.row');
  var checkboxName = $row.data('for');
  var $checkbox = $(`input[type="checkbox"][name="${checkboxName}"]`);
  
  $row.remove();
  $checkbox.prop('checked', false);
  $checkbox.get(0).hasCovered = false;
});

$(document).ready(function() {
  $("#add_data").click(function() {
    var grid = document.getElementById("Table1");
    var message = "Values                 Description\n";

    var checkBoxes = grid.getElementsByTagName("INPUT");
    var str = ''

    for (var i = 0; i < checkBoxes.length; i++) {
      if (
        checkBoxes[i].checked &&
        checkBoxes[i].name !== "allcb" &&
        !checkBoxes[i].hasCovered
      ) {
        var row = checkBoxes[i].parentNode.parentNode;
        str +=
          '<div class="row" data-for="' + checkBoxes[i].id + '"><div class="col-md-8"><p class="me-3"> ' +
          '<a href="#" class="text-body">' +
          '<button type="button" class = "remove_data" id="remove_data">Remove item</button></a>&nbsp' +

          '<span>Quantity</span>&nbsp' +
          row.cells[2].innerHTML +
          "</a></p> " +
          '<span class="me-1">Price </span>&nbsp' +
          '<span class="me-1 price_value">' +
          row.cells[1].innerHTML +
          "</span>&nbsp" +
          '<input type="number" id="quantity_input" class="form-control form-control-sm w-px-75 quantity_input" value="1" min="1" max="5"/>&nbsp' +
          '<span class= "total_value_row" >total value is</span> ' +
          "</div><hr></div>";
        checkBoxes[i].hasCovered = true;
      }
    }
    $(".whole-div-class").append(str);
  });


  $("#get_data").click(function() {
    var selected_items = [];
    var $row = $(this).closest('.row');

    var grid = document.getElementById("Table1");
    var checkBoxes = grid.getElementsByTagName("INPUT");
    var str = ''

    for (var i = 0; i < checkBoxes.length; i++) {
      value_input = $(".quantity_input", $row).val();
      console.log(value_input);
      console.log("test");

      var selected_obj ={ 
            quantity: value_input
       }
      selected_items.push(selected_obj);
    }


  });


});

<!-- language: lang-html -->

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <table border="1" id="Table1">
      <thead>
        <tr>
          <th>
            <input type="checkbox" id="allcb" name="allcb" />
          </th>
          <th>Price</th>
          <td>Quantity</td>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>
            <input type="checkbox" id="cb1" name="cb1" />
          </td>
          <td>200</td>
          <td> 25</td>
        </tr>
        <tr>
          <td>
            <input type="checkbox" id="cb2" name="cb2" />
          </td>
          <td>300</td>
          <td>30</td>
        </tr>
        <tr>
          <td>
            <input type="checkbox" id="cb3" name="cb3" />
          </td>
          <td>400</td>
          <td>50</td>
        </tr>
      </tbody>
    </table>
    <br />
    <button type="button" id="add_data">Add datas</button>
    <button type="button" id="get_data">Get all input type data</button>
    
    <ul class="list-group mb-3 row whole-div-class"></ul>

<!-- end snippet -->

You can select all the input elements by class, then use map to get an array of objects.

const selectedItems = $('.quantity_input').map((i, el) => ({quantity: el.value})).get();